Investigation of Friedel-Crafts alkylation in the …downloads.hindawi.com/journals/jchem/2012/610579.pdfwith 1:3 ratio with 0.1 g of stabilized cellulose sulfonic acid on silica gel

ISSN: 0973-4945; CODEN ECJHAO

E-Journal of Chemistry

http://www.ejchem.net 2012, 9(4), 1875-1884

Investigation of Friedel-Crafts Alkylation in the

Presence of Supported Sulfonic Acid on Silica Gel

A. R. KIASAT 1, M. KARIMI-CHESHMEALI

2,

R. SOLEYMANI3*

, AND H. RAJABZADEH4

1Department of Chemistry

Shahid Chamran University, Ahvaz, Iran 2Department of Chemistry, Omidiyeh Branch

Islamic Azad University, Omidiyeh , Iran

3Young Researchers Club, Shahre Rey Branch

Islamic Azad University, Tehran, Iran 4Department of Chemistry, Dezful Branch

Islamic Azad University, Dezful, Iran

[email protected]

Received 11 August 2011; Accepted 26 October 2011

Abstract: From the Reaction between cellulose and chloro sulfonic acid was

prepared sulfuric acid cellulose composition as a new solid acid. The solid acid

supported on silica gel and then as an effective catalyst in Friedel-Crafts

alkylation of alcohols and aromatic compounds was used. The reaction progress

was controlled using thin layer chromatography and the reaction products were

analyzed using IR spectroscopy devise. The results show this new catalyst is

effective in the friedel crafts alkylation and C-C bond formation was done in

short time with very good yields.

Keywords: Catalyst, Cellulose sulfuric acid, Friedel-Crafts alkylation, Silica gel.

Introduction

Catalysts are compounds that can speed up chemical reactions, but they do not participate in

it. From Different types of catalysts can be named acidic catalyst that would have used a lot

in many chemical reactions. These compounds have many applications in various chemical

reactions1-7

. The acid catalyst that is commonly used, are based on acids such as HF, H2SO4,

HCLO4, H3PO4. The solid acids have some advantages such as easy operation; reduce

corrosion and easy disposal8-15

. Also, the development of cleaner synthetic methods,

reducing waste and by-products, or stop making them, in addition to cost effectiveness that

help to human in order to clean the environment, are its benefits of these catalysts12-14

.

Currently, hundreds of industrial processes use the solid acids such as zeolites, mixed oxides

containing heteropoly acids and phosphates13,14

. Catalyzed reactions due to high selectivity

in chemical processes are superior relative to stoichiometry material. The organic

R. SOLEYMANI et al. 1876

compounds are divided to two categories, the aliphatic and aromatic compound. The

aromatic compounds have high degree of unsaturated and they can be as a source of

electrons for electrophilic attack. The reaction of aromatic compounds with electrophils,

such as nitrogen, sulfure and halogen is an electrophilic substitution reaction. Alkylation and

acylation reactions are the most important of aromatic substitution reactions15-17

. Charles

Friedel and James Crafts presented a report about the carbon - carbon formation and

carbonic skeleton increasing of reacted benzene with 2-chloro propane in the presence of

aluminum chloride in the 1877. The importance of this reaction is due to formation of

carbon – carbon bond and increasing of carbonic skull in these compounds18-20

. Friedel-

Crafts alkylation is one of the important methods of alkylation. In this reaction an alkyl

group will be added to the aromatic compound in the presence of a catalyst and new C-C

bond is formed15-17

. Common methods of Friedel - Crafts alkylation are: a) alkylation using

alkyl halide in the presence of Lewis acid, b) alkylation using an alkene in the present of

Lewis acid, c) alkylation using an alcohol in the present of lewis acid21

. The mechanism of

electrophilic substitution reaction begins with the formation of carbocation (I) and then an

aromatic compound attack to carbocation as a nucleophile and arenium ion is formed,

arenium ion with the loss of a proton is changed to benzene alkyl21

.

It is noteworthy that the reaction of Friedel-Crafts is done in the presence of Lewis acids.

Therefore, each agent in the environment that produces carbocation, is causing reactions

Friedel-Craft to be done. Alcohols in an acidic environment are more willing to do for the

carbocation formation and Friedel-Craft alkylation with aromatic compounds. Problems such

as corrosion and the transportation is causing many problems for using in industrial

applications. For this purpose the solid acid is used to replace. But the main reason for the use

of solid acids is that these compounds have too much acidic character. These compounds are

highly compatible in environment and as safe and nontoxic compounds have hydroxyl number

of first and second type that it causing they are easily converted to sulfonic acid. Studies in the

field of silica sulfuric acid were done by M.A.Zolfigol in 2001. This solid acid as a mineral

solid acid is highly acidic character. Silica sulfuric acid is prepared from the reaction between

chlorosulfonic acid and silica without the use of solvents under inert gas22

(Figure 1).

SiO2 OH + ClSO3H SiO2 OSO3H + HClr.t

Figure 1. Common methods illustration of Friedel-Crafts alkylation.

The other mechanism, silica is produced from a reaction between a meta acid-alkaline

and acid. This is usually done by passing carbon dioxide gas into sodium meta silicate

diluted solution. Usually this solution is conversed to a gel and Na ions are washed and

dried. Silanol groups are condensed and they form the polymer siloxane, this act creates an

amorphous material consisting of spherical particles consisting of SiO4 groups irregularly.

Applications of silica gel are due to its surface characters and depend on the distribution and

nature of hydroxyl groups on the surface23-41

. Various techniques such as NMR, IR, Raman,

and chemical experiments have been used to determine the silica structure. The results

obtained show that OH groups present in silica surface. This compound was studied in

various mechanisms such as phenols nitration, de-protection of tri methyl silyl ether, the

epoxy ring opening, oxidation of alcohol, aldol ketone condensation and the other reactions

as a catalyst23-41

.

Investigation of Friedel-Crafts Alkylation in the Presence 1877

Experimental

Raw materials purchased for the reaction from Merck and were used without any

purification. The reaction progress was followed using TLC thin layer chromatography. The

reaction product was determined using IR spectroscopy. The whole process was done using

TLC-Card Silica Gel – G/UV 254 nm, analytical balance Mitller/Colleg 150, OVEN/Model:

U30/W:800-Shimaz CO, FT-IR: Spectrometer – Spectrum RX 1 perkin Elmer AVE

(4000-400 cm-1

), pH meter: Horiba model:f-ΙΙE. The reaction is as follows:

Preparation of Stabilized Sulfonic Acid on Silica Gel

Cellulose and carbon tetrachloride have transferred to an Erlenmeyer flask with two

openings and Meyer had put on a magnetic mixer. Then we added chloroSulfonic acid and

carbon tetrachloride to drip into the Erlenmeyer flask containing cellulose and carbon

tetrachloride. Also we did the reaction under the vacuum circumstance in order to expedite

the removal of HCl gas and prevent moisture absorption by the obtained catalyst (Figure 2).

Figure 2. Demonstration of Friedel-Crafts reaction in the presence of Lewis acid.

Obtained Cellulose sulfonic acid product is as a gel and it is difficult to work it. We

added silica gel to be a homogeneous black powder (Figure 3).

Figure 3. The reaction of chlorosulfonic acid and silica gel in presence of inert gas.

Cl S

OH

OO O

HO

OH

OH

OO

OH

OH

O

HO

HClO

HO3SO

OSO3H

OSO3H

OO

OSO3H

OSO3H

O

HO3SOr.t


MeO

OH

Acidic Capacity Determination of Stabilized Sulfonic Acid Cellulose on Silica Gel

by Titration

Suspension of 1 g of solid acid in 25 mL of distilled water was prepared and it was titrated

with Soda solution 0.1 M in the presence of phenolphthalein. 66 ml was used to achieve eq

point. Thus, the acid capacity is 6 / 6 mmol per gram of acid and the pH of solution is 1.22

using pH meter.

Optimize the Reaction Conditions

To get the best reaction conditions, 1 mmol (138 / 0 g) para methoxy banzyl alcohol and

3 mL of benzene as initial materials with different amounts of weight stabilized cellulose

sulfonic acid on silica gel (05/0-5) were mixed and the reaction was done in reflux

condition. The Reaction progress was followed by thin layer chromatography (TLC) and n-

hexane- ether (2:8) in the tank.

The Method of Alcohol Alkylation and Numerous Aromatic Compounds in the

Presence of Supported Sulfonic Acid on Silica Gel

Amount of alcohol and aromatic compounds (benzene, toluene and ortho Dichloro benzene)

with 1:3 ratio with 0.1 g of stabilized cellulose sulfonic acid on silica gel was poured into a

25 ml balloon and the reaction mixture was placed under reflux. The Reaction progress was

followed by thin layer chromatography (TLC) and n-hexane-ether (2:8) in the tank. After

completing the reaction, the reaction mixture was filtered. Solvent mixture by calcium

chloride was dehydrated and then was filtered. Finally, it was vaporized by rotary and the

products extracted with the different yield.

Results and Discussion

After the initial reaction, products were obtained with yields between 73 to 92 percent. To

identify the reaction products in addition to following up with chromatography TLC thin

layer was used IR spectroscopy. In alcohol structure, existence of broad and index peak at

3000 cm-1

related to OH group is evident and with the end of the reaction peak gradually

disappears. Also we did not use 1H-NMR spectroscopy to identify products.

The ortho and para hydrogen in the 1H-NMR spectrum was not easily identifiable because

the studied compound structure has a low polarity. The results and identified products are

reported in Table 1. Comparing the results shows that replacement of a substitute on the benzene

ring in alcohol, carbocation intermediate, is stable and the reaction rate increases (Figure 4).

Table 1. The results related to Friedel-Crafts reaction of alcoholic and aromatic structure in

the presence of supported acid on silica gel.

Yie

ld,

%

Tim

e,

Min

Product Aromatic

structure Substrates

En

try

98 5

1

89 5

2

MeO

MeO

OH

MeO


MeO

OH

(H3C)3C

OH

OH

Cl

Cl

89 7

3

93 10

9

91 20

5

95 15

6

96 10

7

79 39

9

73 40

8

75 30

19

99 25

11

77 50

12

MeO

MeO

OH

Cl

Cl

MeO

Cl

Cl

(H3C)3C

OH

(H3C)3C

(H3C)3C

OH

(H3C)3C

(H3C)3C

Cl

Cl(H3C)3C

OH

(H3C)3C

Cl

Cl

OH

OH

OH

Cl

Cl


OH

Cl

OH

OH

95 50

13

99 40

19

89 60

15

78 75

16

73 195

17

99 79

19

79 65

18

75 115

29

73 69

OH

21

97 95

OH

22

95 92

OH

23

OH

Cl

Cl

OH

ClCl

Cl

OH

Cl

Cl

Cl

Cl

ClCl

OH

OHCl

Cl

Cl

Cl

C(CH3)3

C(CH3)3

C(CH3)3


73 79

OH

29

99 69

25

82 59

26

95 95

27

99 75

29

89 39

28

93 17

39

99 20

31

77 45

32

C(CH3)3

Cl

ClCl

Cl

OH

OH

OH

Cl

Cl

Cl

Cl

OH

OMe

OH

OMe

OMe

OH

OMe

OH

OMeOMe

OH

OMe

Cl

Cl

OMe

Cl

Cl


Figure 4. Preparation schematic of supported sulfonic acid on silica gel.

According to the result, groups that are causing instability carbocation, reduce reaction

rate. To confirm this effect, para nitro benzene alcohol reacts fridel-crafts with benzene. The

results show that the reaction rate sharply decreased and the reaction was not complete even

after 360 minutes (Figure 5).

Figure 5. The mechanism of preparation of supported sulfonic acid on silica gel.

1 mM of various alcohols with 3 ml of toluene was provided. Methyl substituted is

electron donor and activator of benzene ring in electrophilic substitution reaction. It is

expected that the reaction rate increases. The results is given at Table 1. The reaction rate of

toluene is more than benzene (Figure 6).

OH

MeO

OH

Cl

MeO

Cl

5min,94%

50min,85%

OH

CSA

105min,80%

CSA

OH C

Me

Me

Me

60min,78%

OH

NO2

CSA,( 0.1 gr)

Not Complete

360 min


Figure 6. The mechanism of alcohols Friedel-Crafts alkylation reaction with benzene in the

presence of supported cellulose sulfonic acid on silica gel.

Para xylene aromatic compound was selected as a aromatic ring and Friedel- Crafts

alkylation of this compound was performed with the various alcohol at the presence of

cellulose sulfonic acid (Table 1).

The effect of electron donor and recipient substituted groups on the benzene ring of

ortho chloro benzene was studied. Halogens are known as a weak inactivate substitute and

director of ortho and para position. 1 mM of various alcohols with 3 mL of benzene ortho

chlorine was mixed and refluxed at the presence of 0.1 g supported cellulose sulfonic acid

on silica gel. Halide groups inactivate the rings against substitute reactions and reduce the

reaction rate (Figure 7).

Figure 7. Demonstration of Friedel-Crafts alkylation reaction with benzene in the presence

of supported cellulose sulfonic acid on silica gel.

Conclusion

The results showed that the mechanism of solid cellulose sulfonic acid has higher efficiency

than hydrochloric acid and the elimination of sulfonic acid and replacement of hydrochloric

acid, risks and problems in the mechanism of cellulose is less. Also unlike other catalysts,

cellulose sulfonic acid catalyst is easily removed from the system. The preparation of

cellulose Sulfonic acid catalysts will be easier, faster and cheaper than the other catalysts.

The separation and purification products do not require a complicated process. Finally. This

catalyst will be as The solid acid catalyst environmentally friendly. The catalytic reaction of

Friedel -Crafts would be very salient.

Acknowledgment This work was supported by Islamic Azad University Shahre-rey branch, Shahid Chamran

University, Islamic Azad University Omidie branch and Islamic Azad University Dezful

branch.

OHCSA

CSA

20min,90%

5min,90%

OH

Cl

Cl

Cl

Cl

CSA

CSA

50min,85%

30min,84%


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Investigation of Friedel-Crafts alkylation in the …downloads.hindawi.com/journals/jchem/2012/610579.pdfwith 1:3 ratio with 0.1 g of stabilized cellulose sulfonic acid on silica gel